Sealing mechanism for packaging bag

Abstract

The utility model relates to the technical field of packaging equipment, in particular to a sealing mechanism of a packaging bag, which comprises a mechanism frame, a first dowel bar, a second dowel bar, a driving device and a transmission shaft, the transmission shaft is connected with a driving device, a transmission plate is fixed to the transmission shaft, and a first sealing machine, a second sealing machine and a guide rail are arranged in the mechanism frame; after the technical scheme is adopted, the driving device, the transmission shaft, the transmission plate, the first dowel bar and the second dowel bar are matched, the transmission shaft simultaneously drives the first sealing machine and the second sealing machine to synchronously move through the transmission plate, and when the rotation angle of the transmission plate is certain, the positions of the first dowel bar and the first sealing machine are also determined; and the positions of the second dowel bar and the second sealing machine are determined, so that the positions of the first sealing machine and the second sealing machine are ensured to be fixed during heat sealing, and the consistency of sealing and heat sealing forming of the packaging bag is relatively good.

Description

Technical Field

[0001] This utility model relates to the field of packaging equipment technology, specifically to a sealing mechanism for packaging bags. Background Technology

[0002] A sealing mechanism for food production is disclosed in Chinese utility model patent document CN221563680U. This sealing mechanism includes a frame, a sealing mechanism, and an exhaust mechanism. The sealing mechanism is mounted on the frame and includes an upper hot-melt plate, a lower hot-melt plate, an upper driver, and a lower driver. The upper and lower hot-melt plates are correspondingly arranged, with the upper hot-melt plate and the upper driver being drivenly connected, and the lower hot-melt plate and the lower driver being drivenly connected. The exhaust mechanism is mounted on the frame and includes a mounting base, a rotating shaft, an exhaust plate, an elastic fixing component, and an exhaust driver. The mounting base is mounted on the frame, the rotating shaft is rotatably mounted on the mounting base, the exhaust plate is fixedly connected to the rotating shaft, one end of the elastic fixing component is connected to the mounting base, the other end of the elastic fixing component abuts against the exhaust plate, and the exhaust driver is fixedly mounted on the mounting base. The rotating shaft and the exhaust driver are drivenly connected.

[0003] However, the sealing mechanism for food production mentioned above still has the following problems: it requires two drivers to move the two hot melt plates respectively, that is, the upper driver moves the upper hot melt plate and the lower driver moves the lower hot melt plate. The two hot melt plates are not synchronized, making it difficult to ensure that the positions of the two hot melt plates are fixed during heat sealing, resulting in relatively poor consistency of the sealing position of the packaging bag after heat sealing.

[0004] In view of this, the applicant has conducted in-depth research on the above-mentioned issues, which led to this case. Utility Model Content

[0005] The purpose of this invention is to provide a sealing mechanism that ensures relatively good consistency in the sealing position of the packaging bag after heat sealing.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A sealing mechanism for a packaging bag, comprising a mechanism frame,

[0008] It also includes a first force transmission rod, a second force transmission rod, a drive device mounted on the mechanism frame, and a transmission shaft rotatably connected to the mechanism frame; the transmission shaft is located within the space enclosed by the mechanism frame;

[0009] The transmission shaft is connected to the output shaft of the drive device. A transmission plate is fixed on the transmission shaft. The transmission plate has a first transmission end and a second transmission end. The transmission shaft is located between the first transmission end and the second transmission end.

[0010] The space enclosed by the mechanism frame is provided with a first sealing machine and a second sealing machine; the first sealing machine is located on one side of the drive shaft; the second sealing machine is located between the drive shaft and the first sealing machine;

[0011] The space enclosed by the mechanism frame is provided with guide rails, which are arranged perpendicularly to the transmission shaft.

[0012] The first sealing machine and the second sealing machine are arranged opposite to each other. The first sealing machine includes a first base, and the second sealing machine includes a second base. The first base and the second base are slidably connected to the guide rail.

[0013] One end of the first force transmission rod is rotatably connected to the first machine base, and the other end is rotatably connected to the first transmission end;

[0014] One end of the second force transmission rod is rotatably connected to the second base, and the other end is rotatably connected to the second transmission end.

[0015] Preferably, a first sealing knife is mounted on the first base;

[0016] The second sealing knife is installed on the second base;

[0017] The first sealing blade and the second sealing blade are arranged opposite to each other;

[0018] A heating rod is installed on the first sealing knife;

[0019] A heating rod is installed on the second sealing knife.

[0020] Preferably, a first ear plate is fixed on the first base, the first ear plate has a first ear plate through hole, the first base is provided with a first guide rod arranged parallel to the guide rail, the first guide rod has a first rod portion, one end of the first rod portion is integrally connected to a first column cap, and the other end passes through the first ear plate through hole and is fixed with a first shaping plate; the first base is fixed with a first guide member arranged parallel to the guide rail, the first guide member is slidably connected to the first shaping plate; a first compression spring is sleeved on the first guide rod;

[0021] One end of the first compression spring abuts against the first shaping plate, and the other end abuts against the first ear plate;

[0022] A second ear plate is fixed on the second base, and the second ear plate has a second ear plate through hole. The second base is provided with a second guide rod arranged parallel to the guide rail. The second guide rod has a second rod portion. One end of the second rod portion is integrally connected to a second column cap, and the other end passes through the second ear plate through hole and is fixed with a second shaping plate. A second guide member is fixed on the second base and arranged parallel to the guide rail. The second guide member is slidably connected to the second shaping plate. A second compression spring is sleeved on the second guide rod.

[0023] One end of the second compression spring abuts against the second shaping plate, and the other end abuts against the second ear plate;

[0024] The first shaping plate and the second shaping plate are arranged opposite to each other.

[0025] Preferably, the first rod portion has a first connecting threaded section, which is spirally connected to the first shaping plate;

[0026] The second rod has a second connecting thread section, which is helically connected to the second shaping plate.

[0027] Preferably, a first mounting base is fixed on the first shaping plate, and a first elastic block is mounted on the first mounting base;

[0028] A second mounting base is fixed on the second shaping plate, and a second elastic block is mounted on the second mounting base;

[0029] The first elastic block and the second elastic block are arranged opposite to each other.

[0030] Preferably, the first mounting base includes a first base, a first mounting plate, a first guide post, and a first guide post cap;

[0031] The first base is fixed to the first shaping plate, and the first base is fixed with a first guide column arranged parallel to the guide rail; one end of the first guide column is fixedly connected to the first mounting plate, and the other end passes through the first guide column and is fixedly connected to the first guide column cap; the first guide column and the first guide column are slidably connected.

[0032] A first guide post compression spring is sleeved on the first guide post, with one end of the first guide post compression spring abutting against the first mounting plate and the other end abutting against the first guide post cylinder;

[0033] The first elastic block is mounted on the first mounting plate.

[0034] Preferably, the second mounting base includes a second base; the second base is fixed to the second shaping plate by a bolt assembly; and the second elastic block is mounted on the second base.

[0035] Preferably, the first elastic block is a sponge, and the second elastic block is a sponge.

[0036] Preferably, the drive shaft is rotatably connected to the mechanism frame via a bearing housing;

[0037] The drive device includes a servo motor, the housing of which is fixed to the mechanism frame, and the output shaft of the servo motor is connected to the transmission shaft via a coupling.

[0038] Preferably, one end of the first force transmission rod has a first threaded section, and the other end has a second threaded section;

[0039] The first threaded segment and the second threaded segment have opposite helical directions;

[0040] The first threaded section is helically connected to a first connecting rod sleeve, and the second threaded section is helically connected to a second connecting rod sleeve. One end of the first force transmission rod is rotatably connected to the first machine base through the first connecting rod sleeve, and the other end of the first force transmission rod is rotatably connected to the first transmission end through the second connecting rod sleeve.

[0041] The beneficial effects of this utility model by adopting the above technical solution are:

[0042] By utilizing the cooperation of the drive device, drive shaft, drive plate, first force transmission rod and second force transmission rod, the drive shaft drives the first sealing machine and the second sealing machine to move synchronously through the drive plate. When the rotation angle of the drive plate is constant, the positions of the first force transmission rod and the first sealing machine are also determined, as are the positions of the second force transmission rod and the second sealing machine. This ensures that the positions of the first sealing machine and the second sealing machine are fixed during heat sealing, resulting in relatively good consistency of the sealing position of the packaging bag after heat sealing. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the sealing mechanism of this utility model;

[0044] Figure 2 for Figure 1 An enlarged structural diagram at position A;

[0045] Figure 3 for Figure 1 A magnified structural diagram at position B.

[0046] In the picture:

[0047] 100 - Mechanism frame; 110 - Guide rail;

[0048] 120 - First guide component; 130 - Second guide component;

[0049] 200 - Drive unit;

[0050] 210 - Drive shaft; 211 - Drive plate;

[0051] 230 - First force transmission rod; 240 - Second force transmission rod;

[0052] 300 - First sealing machine; 310 - First machine base;

[0053] 320 - First sealing blade; 330 - First guide rod;

[0054] 340 - First shaping plate; 350 - First mounting base;

[0055] 351 - First base; 352 - First mounting plate;

[0056] 353 - First guide post; 354 ​​- First guide post cap;

[0057] 360 - First elastic block; 370 - First ear plate;

[0058] 400 - Second sealing machine; 410 - Second machine base;

[0059] 420 - Second sealing blade; 430 - Second guide rod;

[0060] 440 - Second shaping plate; 450 - Second mounting base;

[0061] 460 - Second elastic block; 470 - Second ear plate. Detailed Implementation

[0062] To make the objectives, technical solutions, and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this utility model.

[0063] like Figures 1-3 As shown, this embodiment provides a sealing mechanism for a packaging bag, including a mechanism frame 100, a first force transmission rod 230, a second force transmission rod 240, a driving device 200, and a transmission shaft 210.

[0064] The drive unit 200 includes a servo motor, the housing of which is fixed on the mechanism frame 100, and the output shaft of the servo motor is connected to the transmission shaft 210 via a coupling.

[0065] The drive shaft 210 is located within the space enclosed by the mechanism frame 100, and the drive shaft 210 is rotatably connected to the mechanism frame 100 through a bearing seat. A transmission plate 211 is fixed on the transmission shaft 210. The transmission plate 211 has a first transmission end and a second transmission end. The transmission shaft 210 is located between the first transmission end and the second transmission end. In this embodiment, there are two transmission plates 211. The two transmission plates 211 have the same structure and are arranged parallel to each other along the axial direction of the transmission shaft 210. In the same transmission plate 211, the first transmission end and the second transmission end are arranged symmetrically with the transmission shaft 210 as the center. The line connecting the first transmission ends of the two transmission plates 211 is arranged parallel to the transmission shaft 210, and the line connecting the second transmission ends of the two transmission plates 211 is also arranged parallel to the transmission shaft 210. It should be noted that the lines connecting the first transmission ends and the second transmission ends of the two transmission plates 211 are virtual auxiliary lines and are not real lines. The purpose of introducing these two virtual auxiliary lines is to better describe the positional relationship between the first transmission ends and the second transmission ends of the two transmission plates 211 and the transmission shaft 210.

[0066] The space enclosed by the mechanism frame 100 is provided with a first sealing machine 300 and a second sealing machine 400. The first sealing machine 300 is located on one side of the drive shaft 210, and the second sealing machine 400 is located between the drive shaft 210 and the first sealing machine 300. The first sealing machine 300 and the second sealing machine 400 are arranged opposite to each other and are slidably connected to the mechanism frame 100.

[0067] In this embodiment, a guide rail 110 is provided within the space enclosed by the mechanism frame 100. The guide rail 110 is arranged perpendicularly to the transmission shaft 210. In this embodiment, there are two guide rails 110, namely the first guide rail and the second guide rail, which are arranged in parallel. For ease of explanation, the plane containing the first guide rail and the second guide rail is defined as the first reference plane.

[0068] The first sealing machine 300 includes a first base 310, and the second sealing machine 400 includes a second base 320.

[0069] One end of the first base 310 is slidably connected to the first guide rail, and the other end is slidably connected to the second guide rail; one end of the second base 410 is slidably connected to the first guide rail, and the other end is slidably connected to the second guide rail.

[0070] A first sealing knife 320 is mounted on a first base 310, specifically, the first sealing knife 320 is fixed to the first base 310 by a bolt assembly; a second sealing knife 420 is mounted on a second base 410, specifically, the second sealing knife 420 is fixed to the second base 410 by a bolt assembly. The first sealing knife 320 and the second sealing knife 420 are located on the same plane and are arranged opposite to each other, specifically, the cutting edges of the first sealing knife 320 and the second sealing knife 420 face each other; wherein, the end of the first sealing knife 320 near the second sealing knife 420 is arranged parallel to the end of the second sealing knife 420 near the first sealing knife 320, and a heating rod is mounted on both the first sealing knife 320 and the second sealing knife 420.

[0071] The plane containing the first sealing blade 320 and the second sealing blade 420 is defined as the second reference plane. The second reference plane is arranged parallel to the first reference plane or coincides with the first reference plane. In this embodiment, the first reference plane and the second reference plane are arranged parallel to each other.

[0072] In this embodiment, there are two first force transmission rods 230, both with identical structures, arranged in parallel, and connected to the two transmission plates 211 respectively. Similarly, there are two second force transmission rods 240, both with identical structures, arranged in parallel, and connected to the two transmission plates 211 respectively. One transmission plate 211, its corresponding first force transmission rod 230, and its corresponding second force transmission rod 240 are defined as a transmission group.

[0073] For ease of explanation, we will take one of the transmission groups as an example.

[0074] One end of the first force transmission rod 230 is rotatably connected to the first sealing machine 300, and the other end is rotatably connected to the first transmission end. Specifically, a first connecting rod sleeve is installed at one end of the first force transmission rod 230, and a second connecting rod sleeve is installed at the other end. A first connecting seat is fixed on the first base 310 of the first sealing machine 300. The first connecting rod sleeve has a first through hole, which is arranged parallel to the transmission shaft 210. A first bolt is provided in the first through hole. The first bolt includes a head section, a smooth section, and a threaded section integrally formed in sequence. One end of the smooth section is connected to the head section, and the other end is connected to the threaded section. The threaded section of the first bolt passes through the first through hole and is screwed to the first connecting seat. The smooth section of the first bolt is inserted into the first through hole. The second connecting rod sleeve has a second through hole, which is parallel to the transmission shaft 210. A second bolt is provided in the second through hole. The second bolt has the same structure as the first bolt and will not be described again. The threaded section of the second bolt passes through the second through hole and is helically connected to the first transmission end, while the smooth section of the second bolt is inserted into the second through hole.

[0075] One end of the second force transmission rod 240 is rotatably connected to the second sealing machine 400, and the other end is rotatably connected to the second transmission end. Specifically, a third connecting rod sleeve is installed at one end of the second force transmission rod 230, and a fourth connecting rod sleeve is installed at the other end. A second connecting seat is fixed on the second base 410 of the second sealing machine 400. The third connecting rod sleeve has a third through hole, which is arranged parallel to the transmission shaft 210. A third bolt is installed in the third through hole. The third bolt has the same structure as the first bolt, and will not be described in detail. The threaded section of the third bolt passes through the third through hole and is helically connected to the second connecting seat. The smooth section of the third bolt is inserted into the third through hole. The fourth connecting rod sleeve has a fourth through hole, which is parallel to the transmission shaft 210. A fourth bolt is installed in the fourth through hole. The fourth bolt has the same structure as the first bolt, and will not be described in detail. The threaded section of the fourth bolt passes through the fourth through hole and is helically connected to the second transmission end. The smooth section of the fourth bolt is inserted into the fourth through hole.

[0076] The first bolt, the second bolt, the third bolt, and the fourth bolt are arranged parallel to the drive shaft 210.

[0077] In use, when it is necessary to move the first sealing machine 300 and the second sealing machine 400 away from each other, the servo motor rotates forward, and the transmission shaft 210 simultaneously drives the first force transmission rod 230 and the second force transmission rod 240 to move through the transmission plate 211. The first force transmission rod 230 drives the first sealing machine 300 to move away from the second sealing machine 400, and the second force transmission rod 240 drives the second sealing machine 400 to move away from the second sealing machine 300. When it is necessary to move the first sealing machine 300 and the second sealing machine 400 closer to each other, the servo motor rotates in reverse, and the transmission shaft 210 simultaneously drives the first force transmission rod 230 and the second force transmission rod 240 to move through the transmission plate 211. The first force transmission rod 230 drives the first sealing machine 300 to move closer to the second sealing machine 400, and the second force transmission rod 240 drives the second sealing machine 400 to move closer to the second sealing machine 300. When the servo motor rotates forward, the first sealing machine 300 and the second sealing machine 400 move away from each other; when the servo motor rotates in reverse, the first sealing machine 300 and the second sealing machine 400 move closer to each other until they come into contact.

[0078] By adopting the above technical solution, the drive device 200, drive shaft 210, drive plate 211, first force transmission rod 230 and second force transmission rod 240 are used in conjunction. The drive shaft 210 drives the first sealing machine 300 and the second sealing machine 400 to move synchronously through the drive plate 211. When the rotation angle of the drive plate 211 is constant, the positions of the first force transmission rod 230 and the first sealing machine 300 are also determined, and the positions of the second force transmission rod 240 and the second sealing machine 400 are also determined. This ensures that the positions of the first sealing machine 300 and the second sealing machine 400 are fixed during heat sealing, resulting in relatively good consistency of the sealing position of the packaging bag after heat sealing.

[0079] As a further preferred embodiment, one end of the first force transmission rod 230 has a first threaded section, and the other end has a second threaded section. The first and second threaded sections have opposite helical directions. The first connecting rod sleeve is helically connected to the first threaded section, and the second connecting rod sleeve is helically connected to the second threaded section. By using the first and second threaded sections with opposite helical directions, and by helically connecting the first and second connecting rod sleeves to the first and second threaded sections, rotating the first force transmission rod 230 can adjust the distance between the first sealing machine 300 and the first transmission end, thereby adjusting the position when the first sealing machine 300 and the second sealing machine 400 are in contact, i.e., adjusting the sealing position, thus adapting to the needs of different sealing positions.

[0080] A first ear plate 370 is fixed on the first base 310. The first ear plate 370 has a first ear plate through hole. The first base 310 is provided with a first guide rod 330 arranged parallel to the guide rail 110. The first guide rod 330 has a first rod portion. One end of the first rod portion is integrally connected to a first post cap, and the other end passes through the first ear plate through hole and is fixed to a first shaping plate 340. The first rod portion has a first connecting threaded section, which is screwed to the first shaping plate 340. A first guide member 120 is fixed on the first base 310 and arranged parallel to the guide rail 110. The first guide member 120 is slidably connected to the first shaping plate 340. A first compression spring (not shown in the figure) is sleeved on the first guide rod 330. One end of the first compression spring abuts against the first shaping plate 340, and the other end abuts against the first ear plate 370.

[0081] A second ear plate 470 is fixed on the second base 410. The second ear plate 470 has a second ear plate through hole. The second base 410 is provided with a second guide rod 430 arranged parallel to the guide rail 110. The second guide rod 430 has a second rod portion. One end of the second rod portion is integrally connected to a second post cap, and the other end passes through the second ear plate through hole and is fixed to a second shaping plate 440. The second rod portion has a second connecting threaded section, which is screwed to the second shaping plate 440. A second guide member 130 is fixed on the second base 410 and arranged parallel to the guide rail 110. The second guide member 130 is slidably connected to the second shaping plate 440. A second compression spring (not shown in the figure) is sleeved on the second guide rod 430. One end of the second compression spring abuts against the second shaping plate 440, and the other end abuts against the second ear plate 470. The first shaping plate 340 and the second shaping plate 440 are arranged opposite to each other.

[0082] The first shaping plate 340 and the second shaping plate 440 are respectively arranged parallel to the second reference plane. The projection of the opposite end of the first shaping plate 340 and the second shaping plate 440 on the second reference plane is located between the first sealing blade 320 and the second sealing blade 420 and is arranged parallel to the first sealing blade 320. The projection of the opposite end of the second shaping plate 440 and the first shaping plate 340 on the second reference plane is located between the first sealing blade 320 and the second sealing blade 420 and is arranged parallel to the second sealing blade 420.

[0083] During heat sealing, when the servo motor reverses, the first sealing machine 300 and the second sealing machine 400 simultaneously move closer to each other. First, the first shaping plate 340 and the second shaping plate 440 simultaneously or sequentially touch the packaging bag, then press down on the packaging bag and fix the bag opening. Subsequently, the first sealing knife 320 and the second sealing knife 420 contact the packaging bag and perform heat sealing on the packaging bag. After heat sealing is completed, the servo motor rotates forward, and the first sealing machine 300 and the second sealing machine 400 simultaneously move apart. The first sealing knife 320 and the second sealing knife 420 first separate from the packaging bag, and then the first shaping plate 340 and the second shaping plate 440 separate from the packaging bag. Because the first shaping plate 340 is acted upon by the first compression spring and the second shaping plate 440 is acted upon by the second compression spring, when the first sealing machine 300 and the second sealing machine 400 just begin to separate, the first shaping plate 340 and the second shaping plate 440 are still clamped on the packaging bag. The first sealing knife 320 moves synchronously with the first sealing machine 300, and the second sealing knife 420 moves synchronously with the second sealing machine 400. As the separation distance between the first sealing machine 300 and the second sealing knife 420 increases, the first pillar cap abuts against the first ear plate 370, and the second pillar cap abuts against the second ear plate 470. The first shaping plate 340 and the second shaping plate 440 separate from the packaging bag respectively. At the same time, the first shaping plate 340 moves synchronously with the first sealing machine 300, and the second shaping plate 440 moves synchronously with the second sealing machine 400.

[0084] A first mounting base 350 is fixed on the first shaping plate 340. The first mounting base 350 includes a first base 351, a first mounting plate 352, a first guide post 353, and a first guide post cap 354. The first base 351 is fixed to the first shaping plate 340, and a first guide post cylinder arranged parallel to the guide rail 110 is fixed on the first base 351. One end of the first guide post 353 is fixedly connected to the first mounting plate 352, and the other end passes through the first guide post cylinder and is fixedly connected to the first guide post cap 354. The first guide post 353 is slidably connected to the first guide post cylinder. A first guide post compression spring (not shown in the figure) is sleeved on the first guide post 353. One end of the first guide post compression spring abuts against the first mounting plate 352, and the other end abuts against the first guide post cylinder. A first elastic block 360 is installed on the first mounting plate 352. In this embodiment, the first elastic block 360 is a sponge. It should be noted that the first elastic block 360 can also be made of rubber or rubber sponge, etc., as an elastic structure.

[0085] A second mounting base 450 is fixed on the second shaping plate 440, and a second elastic block 460 is mounted on the second mounting base 450. In this embodiment, the second mounting base 450 includes a second base; the second base is fixed to the second shaping plate 440 by a bolt assembly, and the second elastic block 460 is mounted on the second base. The second elastic block 460 is made of sponge. It should be noted that the second elastic block 460 can also be made of rubber or rubber sponge, or other elastic structures.

[0086] By setting the first elastic block 360 and the second elastic block 460, when the servo motor reverses, the first sealing machine 300 and the second sealing machine 400 simultaneously move closer to each other. The first elastic block 360 and the second elastic block 460 touch the packaging bag simultaneously or sequentially. When the first elastic block 360 and the second elastic block 460 both touch the packaging bag, they gradually press down on the product inside the packaging bag, thus fixing the product inside the packaging bag.

[0087] The present invention has been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the above embodiments. Those skilled in the art can make various modifications to the present invention based on the prior art, and these modifications all fall within the protection scope of the present invention.

Claims

1. A sealing mechanism for a packaging bag, comprising a mechanism frame, characterized in that: It also includes a first force transmission rod, a second force transmission rod, a drive device mounted on the mechanism frame, and a transmission shaft rotatably connected to the mechanism frame; the transmission shaft is located within the space enclosed by the mechanism frame; The transmission shaft is connected to the output shaft of the drive device. A transmission plate is fixed on the transmission shaft. The transmission plate has a first transmission end and a second transmission end. The transmission shaft is located between the first transmission end and the second transmission end. The space enclosed by the mechanism frame is provided with a first sealing machine and a second sealing machine; the first sealing machine is located on one side of the drive shaft; the second sealing machine is located between the drive shaft and the first sealing machine; The space enclosed by the mechanism frame is provided with guide rails, which are arranged perpendicularly to the transmission shaft. The first sealing machine and the second sealing machine are arranged opposite to each other. The first sealing machine includes a first base, and the second sealing machine includes a second base. The first base and the second base are slidably connected to the guide rail. One end of the first force transmission rod is rotatably connected to the first machine base, and the other end is rotatably connected to the first transmission end; One end of the second force transmission rod is rotatably connected to the second base, and the other end is rotatably connected to the second transmission end.

2. The sealing mechanism for a packaging bag as described in claim 1, characterized in that: The first sealing blade is installed on the first base; The second sealing knife is installed on the second base; The first sealing blade and the second sealing blade are arranged opposite to each other; A heating rod is installed on the first sealing knife; A heating rod is installed on the second sealing knife.

3. The sealing mechanism for a packaging bag as described in claim 2, characterized in that: A first ear plate is fixed on the first base, and the first ear plate has a first ear plate through hole. The first base is provided with a first guide rod arranged parallel to the guide rail. The first guide rod has a first rod portion, one end of which is integrally connected to a first column cap, and the other end passes through the first ear plate through hole and is fixed with a first shaping plate. The first base is fixed with a first guide member arranged parallel to the guide rail, and the first guide member is slidably connected to the first shaping plate. A first compression spring is sleeved on the first guide rod. One end of the first compression spring abuts against the first shaping plate, and the other end abuts against the first ear plate; A second ear plate is fixed on the second base, and the second ear plate has a second ear plate through hole. The second base is provided with a second guide rod arranged parallel to the guide rail. The second guide rod has a second rod portion. One end of the second rod portion is integrally connected to a second column cap, and the other end passes through the second ear plate through hole and is fixed with a second shaping plate. A second guide member is fixed on the second base and arranged parallel to the guide rail. The second guide member is slidably connected to the second shaping plate. A second compression spring is sleeved on the second guide rod. One end of the second compression spring abuts against the second shaping plate, and the other end abuts against the second ear plate; The first shaping plate and the second shaping plate are arranged opposite to each other.

4. The sealing mechanism for a packaging bag as described in claim 3, characterized in that: The first rod portion has a first connecting thread section, which is spirally connected to the first shaping plate; The second rod has a second connecting thread section, which is helically connected to the second shaping plate.

5. The sealing mechanism for a packaging bag as described in claim 3, characterized in that: A first mounting base is fixed on the first shaping plate, and a first elastic block is mounted on the first mounting base; A second mounting base is fixed on the second shaping plate, and a second elastic block is mounted on the second mounting base; The first elastic block and the second elastic block are arranged opposite to each other.

6. The sealing mechanism for a packaging bag as described in claim 5, characterized in that: The first mounting base includes a first base, a first mounting plate, a first guide post, and a first guide post cap; The first base is fixed to the first shaping plate, and the first base is fixed with a first guide column arranged parallel to the guide rail; one end of the first guide column is fixedly connected to the first mounting plate, and the other end passes through the first guide column and is fixedly connected to the first guide column cap; the first guide column and the first guide column are slidably connected. A first guide post compression spring is sleeved on the first guide post, with one end of the first guide post compression spring abutting against the first mounting plate and the other end abutting against the first guide post cylinder; The first elastic block is mounted on the first mounting plate.

7. The sealing mechanism for a packaging bag as described in claim 5, characterized in that: The second mounting base includes a second base; the second base is fixed to the second shaping plate by a bolt assembly; the second elastic block is mounted on the second base.

8. The sealing mechanism for a packaging bag as described in claim 5, characterized in that: The first elastic block is a sponge, and the second elastic block is a sponge.

9. The sealing mechanism for a packaging bag as described in claim 1, characterized in that: The drive shaft is rotatably connected to the mechanism frame via a bearing housing; The drive device includes a servo motor, the housing of which is fixed to the mechanism frame, and the output shaft of the servo motor is connected to the transmission shaft via a coupling.

10. The sealing mechanism for a packaging bag as described in claim 1, characterized in that: One end of the first force transmission rod has a first threaded section, and the other end has a second threaded section; The first threaded segment and the second threaded segment have opposite helical directions; The first threaded section is helically connected to a first connecting rod sleeve, and the second threaded section is helically connected to a second connecting rod sleeve. One end of the first force transmission rod is rotatably connected to the first machine base through the first connecting rod sleeve, and the other end of the first force transmission rod is rotatably connected to the first transmission end through the second connecting rod sleeve.

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